The DC high-voltage generator conducts leakage and DC withstand voltage tests on the sample.
Before conducting the load test, install the high-voltage shielded microammeter onto the high-voltage output terminal of the high-voltage voltage booster device, and connect the corresponding dedicated shielding wires to the microammeter and the test sample respectively (for details, please refer to the user manual of the high-voltage shielded microammeter).
Check whether the DC high-voltage generator, discharge rod, voltage multiplier box, test specimen connection lines, and grounding wires are correctly connected, whether the grounding wire connection is reliable, and whether the high-voltage safety distance meets the requirements. Only then can the high-voltage test on the test specimen be carried out.
After confirming that there are no abnormalities with the DC high-voltage generator and other equipment, turn on the single-phase AC 220V power switch. At this point, the green light will be on, indicating that the power is connected. Then, the DC leakage and DC withstand voltage tests of the test sample can be carried out.
If you press the red button, the red light will come on, indicating that the high voltage is connected and the voltage is being raised.
Gradually adjust the coarse and fine adjustments of the pressure regulating potentiometer in a clockwise direction. The output terminal will start to increase the voltage from zero. The voltage increase speed should be 3-5 kV per second. For large-capacitance test samples, the voltage increase should be slower to avoid voltage overshoot. Also, it is necessary to monitor that the charging current of the ammeter does not exceed the larger charging current of the DC generator. When the voltage or current reaches the required value, record the readings of the ammeter and voltmeter at the specified time.
After the test is completed, reduce the pressure. After adjusting the pressure regulating potentiometer to zero both in the coarse and fine settings, then press the green button to cut off the high voltage and turn off the power switch.
After the test is completed, use the discharge rod to discharge the test sample multiple times. Only after the discharge can the work of approaching the test sample and disconnecting the wires be carried out (for detailed instructions on using the discharge rod, please refer to the user manual).
For small-capacity test samples such as zinc oxide arresters and magnetic blowout arresters, first use the coarse adjustment to raise the voltage (current) to 90% of the required value, then use the fine adjustment potentiometer to slowly increase the voltage to the required value. Then read the voltage (current) value from the digital display. If you need to measure the 75% VDC – 1mA of the zinc oxide arrester, first raise the voltage to the point where the current reaches 1mA (at this point, you can record the voltage and current values), then press the yellow button, the voltage will drop to 75% of the original value and remain in this state. At this time, you can read the microampere meter value and the voltage value. After the measurement is completed, turn the voltage adjustment potentiometer counterclockwise back to zero, press the green button, and when you need to increase the voltage again, press the red button.
When testing large-capacitance samples, the voltage increase should be even slower, and it is necessary to monitor that the charging current of the ammeter does not exceed the maximum charging current of the generator. The voltage increase speed must be slowed down to avoid excessive charging current. After the test is completed, turn the voltage adjustment potentiometer counterclockwise back to zero, then press the green button to cut off the high voltage. At this time, pay attention that the voltage on the voltmeter drops to around 15kV, then you can use the discharge rod for multiple discharges to ensure safety.
Post time: Apr-21-2026